三维静载与循环冲击组合作用下砂岩动态力学特性研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (303 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要利用动静组合加载试验装置，对具有不同轴压和围压的砂岩进行循环冲击试验，研究砂岩抵抗循环冲击载荷能力的变化特性，并重点讨论围压和轴压对砂岩动态疲劳力学特性的影响。围压分别设置为4，8，10和12 MPa四个系列，轴向静载荷分别设置为49，84，105和125 MPa四个系列，入射杆上的入射波大小相等，入射能大小为230 J。结果表明，相同围压下，总循环冲击次数随轴压的增大而减小；相同轴压下，随围压的增加，岩石承受的总循环冲击次数增加。随循环冲击次数的增加，岩石动态峰值应力、加载段的变形模量和弹性应变逐渐减小，动态峰值应变和残余应变逐渐增加。动态峰值应力和平均应变率具有良好的负线性关系；相同围压情况下，随轴压的递增，动态峰值应力和平均应变率拟合直线斜率的绝对值越来越大；相同轴压情况下，随着围压的增加，拟合直线斜率的绝对值越来越小。三维静应力情况下，减小轴压或增加围压有利于提高岩石抵抗外部循环冲击的能力。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：岩石力学, 循环冲击, 三维静载荷, 抵抗冲击能力, 动态峰值应力, 变形特性

Abstract：Cyclic impact tests on sandstone under different axial and confining pressures are conducted with a modified three-dimensional split Hopkinson pressure bar(SHPB)，in order to analyze the impact resistance of sandstone with cyclic impact number and to research the effect of axial and confining pressures on dynamic fatigue mechanical properties. Confining pressures are set as 4，8，10 and 12 MPa，and four levels of axial static stresses are 49，84，105 and 125 MPa，respectively. Incident waves in input bar are approximately constant，and incident energy is 230 J. The results show that total cyclic impact number will decrease with the increase in axial stress when the confining pressure is constant. The total cyclic impact number has an increasing trend with the increasing confining pressure when axial compression is constant. With the increasing cyclic impact number，dynamic peak stress，deformation modulus at loading stage and elastic strain decrease，whereas dynamic peak strain and residual strain increase. Rock dynamic peak stress has a good negative linear correlation with average strain rate. When the confining pressure is constant，the absolute values of linear-fitted slope of dynamic peak stress and average strain rate increase gradually with the increase in axial stress；and when the axial stress is constant，the bigger the confining pressure is，the smaller the absolute values of linear-fitted slope is. Decreasing axial compression or increasing confining pressure is able to improve rock resistance to cyclic impact loads when the rock is under three-dimensional static stress.

Key words： rock mechanics cyclic impact three-dimensional static loads impact resistance ability dynamic peak stress deformation characteristic

收稿日期: 2012-08-13

引用本文:

金解放1，李夕兵2，钟海兵1. 三维静载与循环冲击组合作用下砂岩动态力学特性研究[J]. 岩石力学与工程学报, 2013, 32(7): 1358-1372.
JIN Jiefang1，LI Xibing2，ZHONG Haibing1. STUDY OF DYNAMIC MECHANICAL CHARACTERISTIC OF SANDSTONE SUBJECTED TO THREE-DIMENSIONAL COUPLED STATIC-CYCLIC IMPACT LOADINGS. , 2013, 32(7): 1358-1372.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I7/1358

[2]	RAMULU M，CHAKRABORTY A K，SITHARAM T G. Damage assessment of basaltic rock mass due to repeated blasting in a railway tunnelling project—a case study[J]. Tunnelling and Underground Space Technology，2009，24(2)：208-221.
[8]	吕晓聪，许金余，葛洪海，等. 围压对砂岩动态冲击力学性能的影响[J]. 岩石力学与工程学报，2010，29(1)：193-201.(LU Xiaocong，XU Jinyu，GE Honghai，et al. Effects of confining pressure on mechanical behaviors of sandstone under dynamic impact loads[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：193-201. (in Chinese)))
[13]	LI X B，ZHOU Z L，LOK S，et al. Innovative testing technique of rock subjected to coupled static and dynamic loads[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(5)：739-748.
[15]	葛修润，蒋宇，卢允德，等. 周期荷载作用下岩石疲劳变形特性试验研究[J]. 岩石力学与工程学报，2003，22(10)：1 581-1 585. (GE Xiurun，JIANG Yu，LU Yunde，et al. Testing study on fatigue deformation law of rock under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(10)：1 581-1 585.(in Chinese))
[16]	李树春. 周期荷载作用下岩石变形与损伤规律及其非线性特征[博士学位论文][D]. 重庆：重庆大学，2008.(LI Shuchun. Deformation and damage law and its nonlinear characteristics of rock under cyclic load[Ph. D. Thesis][D]. Chongqing：Chongqing University，2008.(in Chinese)) " target="_blank">
[18]	刘军忠，许金余，吕晓聪，等. 冲击压缩荷载下角闪岩的动态力学性能试验研究[J]. 岩石力学与工程学报，2009，28(10)：2 113-2 120. (LIU Junzhong，XU Jinyu，LU Xiaocong，et al. Experimental study on dynamic mechanical properties of amphibolites under impact compressive loading[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(10)：2 113-2 120.(in Chinese))
[3]	LI H B，XIA X，LI J C，et，al. Rock damage control in bedrock blasting excavation for a nuclear power plant[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(2)：210-218.
[10]	金解放，李夕兵，殷志强，等. 循环冲击下波阻抗定义岩石损伤变量的研究[J]. 岩土力学，2011，32(5)：1 385-1 393.(JIN Jiefang，LI Xibing，YIN Zhiqiang，et al. A method for defining rock damage variable by wave impedance under cyclic impact loadings[J]. Rock and Soil Mechanics，2011，32(5)：1 385-1 393.(in Chinese))
[4]	刘明贵，张国华，刘绍波，等. 大帽山小净距隧道群中夹岩累计损伤效应研究[J]. 岩石力学与工程学报，2009，28(7)：1 363-1 369. (LIU Minggui，ZHANG Guohua，LIU Shaobo，et al. Research on accumulative damage effect of interlaid rock in Damaoshan tunnel group with small clear distance[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(7)：1 363-1 369.(in Chinese))
[6]	SINGH P K. Blast vibration damage to underground coal mines from adjacent open-pit blasting[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(8)：959-973.
[11]	金解放，李夕兵，殷志强，等. 轴压和循环冲击次数对砂岩动态力学特性的影响[J]. 煤炭学报，2012，37(6)：923-930.(JIN Jiefang，LI Xibing，YIN Zhiqiang，et al. Effects of axial pressure and number of cyclic impacts on dynamic mechanical characteristics of sandstone[J]. Journal of China Coal Society，2012，37(6)：923-930. (in Chinese))
[9]	许金余，吕晓聪，刘军忠，等. 斜长角闪岩累积损伤特性的围压效应研究[J]. 土木工程学报，2012，45(1)：115-120.(XU Jinyu，LU Xiaocong，LIU Junzhong，et al. Study of the confining pressure effect of amphibolites cumulative damage properties under cyclical impact loadings[J]. China Civil Engineering Journal，2012，45(1)：115-120.(in Chinese))
[14]	ZHOU Y X，XIA K，LI X B，et al. Suggested methods for determining the dynamic strength parameters and mode-I fracture toughness of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences，2012，49(1)：105-112. " target="_blank">
[1]	闫长斌，徐国元，杨飞. 爆破动荷载作用下围岩累积损伤效应声波测试研究[J]. 岩土工程学报，2007，29(1)：88-93.(YAN Changbin，XU Guoyuan，YANG Fei. Measurement of sound waves to study cumulative damage effect on surrounding rock under blasting load[J]. Chinese Journal of Geotechnical Engineering，2007，29(1)：88-93.(in Chinese))
[5]	MA M，BRADY B H. Analysis of the dynamic performance of an underground excavation in jointed rock under repeated seismic loading[J]. Geotechnical and Geological Engineering，1999，17(1)：1-20. " target="_blank">
[7]	LI X B，LOK T S，ZHAO J. Dynamic characteristics of granite subjected to intermediate loading rate[J]. Rock Mechanics and Rock Engineering，2005，38(1)：21-39.
[12]	金解放，李夕兵，王观石，等. 循环冲击载荷作用下砂岩破坏模式及其机制[J]. 中南大学学报：自然科学版，2012，43(4)：1 453-1 461. (JIN Jiefang，LI Xibing，WANG Guanshi，et al. Failure modes and mechanisms of sandstone under cyclic impact loadings[J]. Journal of Central South University：Science and Technology，2012，43(4)：1 453-1 461.(in Chinese)) " target="_blank">
[17]	李夕兵，赖海辉，朱成忠. 冲击载荷作用下岩石破碎能耗及其力学性质的探讨[J]. 矿冶工程，1988，8(1)：15-19.(LI Xibing，LAI Haihui，ZHU Chengzhong. A study of the dynamic properties and energy absorption of rocks[J]. Mining and Metallurgical Engineering，1988，8(1)：15-19.(in Chinese)) " target="_blank">